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  <section id="history-and-license">
<span id="id1"></span><h1>History and License<a class="headerlink" href="#history-and-license" title="Permalink to this headline">¶</a></h1>
<section id="history-of-the-software">
<h2>History of the software<a class="headerlink" href="#history-of-the-software" title="Permalink to this headline">¶</a></h2>
<p>Python was created in the early 1990s by Guido van Rossum at Stichting
Mathematisch Centrum (CWI, see <a class="reference external" href="https://www.cwi.nl/">https://www.cwi.nl/</a>) in the Netherlands as a
successor of a language called ABC.  Guido remains Python’s principal author,
although it includes many contributions from others.</p>
<p>In 1995, Guido continued his work on Python at the Corporation for National
Research Initiatives (CNRI, see <a class="reference external" href="https://www.cnri.reston.va.us/">https://www.cnri.reston.va.us/</a>) in Reston,
Virginia where he released several versions of the software.</p>
<p>In May 2000, Guido and the Python core development team moved to BeOpen.com to
form the BeOpen PythonLabs team.  In October of the same year, the PythonLabs
team moved to Digital Creations (now Zope Corporation; see
<a class="reference external" href="https://www.zope.org/">https://www.zope.org/</a>).  In 2001, the Python Software Foundation (PSF, see
<a class="reference external" href="https://www.python.org/psf/">https://www.python.org/psf/</a>) was formed, a non-profit organization created
specifically to own Python-related Intellectual Property.  Zope Corporation is a
sponsoring member of the PSF.</p>
<p>All Python releases are Open Source (see <a class="reference external" href="https://opensource.org/">https://opensource.org/</a> for the Open
Source Definition). Historically, most, but not all, Python releases have also
been GPL-compatible; the table below summarizes the various releases.</p>
<table class="docutils align-default">
<colgroup>
<col style="width: 23%" />
<col style="width: 20%" />
<col style="width: 17%" />
<col style="width: 17%" />
<col style="width: 24%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>Release</p></th>
<th class="head"><p>Derived from</p></th>
<th class="head"><p>Year</p></th>
<th class="head"><p>Owner</p></th>
<th class="head"><p>GPL compatible?</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>0.9.0 thru 1.2</p></td>
<td><p>n/a</p></td>
<td><p>1991-1995</p></td>
<td><p>CWI</p></td>
<td><p>yes</p></td>
</tr>
<tr class="row-odd"><td><p>1.3 thru 1.5.2</p></td>
<td><p>1.2</p></td>
<td><p>1995-1999</p></td>
<td><p>CNRI</p></td>
<td><p>yes</p></td>
</tr>
<tr class="row-even"><td><p>1.6</p></td>
<td><p>1.5.2</p></td>
<td><p>2000</p></td>
<td><p>CNRI</p></td>
<td><p>no</p></td>
</tr>
<tr class="row-odd"><td><p>2.0</p></td>
<td><p>1.6</p></td>
<td><p>2000</p></td>
<td><p>BeOpen.com</p></td>
<td><p>no</p></td>
</tr>
<tr class="row-even"><td><p>1.6.1</p></td>
<td><p>1.6</p></td>
<td><p>2001</p></td>
<td><p>CNRI</p></td>
<td><p>no</p></td>
</tr>
<tr class="row-odd"><td><p>2.1</p></td>
<td><p>2.0+1.6.1</p></td>
<td><p>2001</p></td>
<td><p>PSF</p></td>
<td><p>no</p></td>
</tr>
<tr class="row-even"><td><p>2.0.1</p></td>
<td><p>2.0+1.6.1</p></td>
<td><p>2001</p></td>
<td><p>PSF</p></td>
<td><p>yes</p></td>
</tr>
<tr class="row-odd"><td><p>2.1.1</p></td>
<td><p>2.1+2.0.1</p></td>
<td><p>2001</p></td>
<td><p>PSF</p></td>
<td><p>yes</p></td>
</tr>
<tr class="row-even"><td><p>2.1.2</p></td>
<td><p>2.1.1</p></td>
<td><p>2002</p></td>
<td><p>PSF</p></td>
<td><p>yes</p></td>
</tr>
<tr class="row-odd"><td><p>2.1.3</p></td>
<td><p>2.1.2</p></td>
<td><p>2002</p></td>
<td><p>PSF</p></td>
<td><p>yes</p></td>
</tr>
<tr class="row-even"><td><p>2.2 and above</p></td>
<td><p>2.1.1</p></td>
<td><p>2001-now</p></td>
<td><p>PSF</p></td>
<td><p>yes</p></td>
</tr>
</tbody>
</table>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>GPL-compatible doesn’t mean that we’re distributing Python under the GPL.  All
Python licenses, unlike the GPL, let you distribute a modified version without
making your changes open source. The GPL-compatible licenses make it possible to
combine Python with other software that is released under the GPL; the others
don’t.</p>
</div>
<p>Thanks to the many outside volunteers who have worked under Guido’s direction to
make these releases possible.</p>
</section>
<section id="terms-and-conditions-for-accessing-or-otherwise-using-python">
<h2>Terms and conditions for accessing or otherwise using Python<a class="headerlink" href="#terms-and-conditions-for-accessing-or-otherwise-using-python" title="Permalink to this headline">¶</a></h2>
<p>Python software and documentation are licensed under the
<a class="reference internal" href="#psf-license"><span class="std std-ref">PSF License Agreement</span></a>.</p>
<p>Starting with Python 3.8.6, examples, recipes, and other code in
the documentation are dual licensed under the PSF License Agreement
and the <a class="reference internal" href="#bsd0"><span class="std std-ref">Zero-Clause BSD license</span></a>.</p>
<p>Some software incorporated into Python is under different licenses.
The licenses are listed with code falling under that license.
See <a class="reference internal" href="#otherlicenses"><span class="std std-ref">Licenses and Acknowledgements for Incorporated Software</span></a> for an incomplete list of these licenses.</p>
<section id="psf-license-agreement-for-python-release">
<span id="psf-license"></span><h3>PSF LICENSE AGREEMENT FOR PYTHON 3.9.6<a class="headerlink" href="#psf-license-agreement-for-python-release" title="Permalink to this headline">¶</a></h3>
<pre class="literal-block">1. This LICENSE AGREEMENT is between the Python Software Foundation (&quot;PSF&quot;), and
   the Individual or Organization (&quot;Licensee&quot;) accessing and otherwise using Python
   3.9.6 software in source or binary form and its associated documentation.

2. Subject to the terms and conditions of this License Agreement, PSF hereby
   grants Licensee a nonexclusive, royalty-free, world-wide license to reproduce,
   analyze, test, perform and/or display publicly, prepare derivative works,
   distribute, and otherwise use Python 3.9.6 alone or in any derivative
   version, provided, however, that PSF's License Agreement and PSF's notice of
   copyright, i.e., &quot;Copyright © 2001-2021 Python Software Foundation; All Rights
   Reserved&quot; are retained in Python 3.9.6 alone or in any derivative version
   prepared by Licensee.

3. In the event Licensee prepares a derivative work that is based on or
   incorporates Python 3.9.6 or any part thereof, and wants to make the
   derivative work available to others as provided herein, then Licensee hereby
   agrees to include in any such work a brief summary of the changes made to Python
   3.9.6.

4. PSF is making Python 3.9.6 available to Licensee on an &quot;AS IS&quot; basis.
   PSF MAKES NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED.  BY WAY OF
   EXAMPLE, BUT NOT LIMITATION, PSF MAKES NO AND DISCLAIMS ANY REPRESENTATION OR
   WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR THAT THE
   USE OF PYTHON 3.9.6 WILL NOT INFRINGE ANY THIRD PARTY RIGHTS.

5. PSF SHALL NOT BE LIABLE TO LICENSEE OR ANY OTHER USERS OF PYTHON 3.9.6
   FOR ANY INCIDENTAL, SPECIAL, OR CONSEQUENTIAL DAMAGES OR LOSS AS A RESULT OF
   MODIFYING, DISTRIBUTING, OR OTHERWISE USING PYTHON 3.9.6, OR ANY DERIVATIVE
   THEREOF, EVEN IF ADVISED OF THE POSSIBILITY THEREOF.

6. This License Agreement will automatically terminate upon a material breach of
   its terms and conditions.

7. Nothing in this License Agreement shall be deemed to create any relationship
   of agency, partnership, or joint venture between PSF and Licensee.  This License
   Agreement does not grant permission to use PSF trademarks or trade name in a
   trademark sense to endorse or promote products or services of Licensee, or any
   third party.

8. By copying, installing or otherwise using Python 3.9.6, Licensee agrees
   to be bound by the terms and conditions of this License Agreement.</pre>
</section>
<section id="beopen-com-license-agreement-for-python-2-0">
<h3>BEOPEN.COM LICENSE AGREEMENT FOR PYTHON 2.0<a class="headerlink" href="#beopen-com-license-agreement-for-python-2-0" title="Permalink to this headline">¶</a></h3>
<p>BEOPEN PYTHON OPEN SOURCE LICENSE AGREEMENT VERSION 1</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>1. This LICENSE AGREEMENT is between BeOpen.com (&quot;BeOpen&quot;), having an office at
   160 Saratoga Avenue, Santa Clara, CA 95051, and the Individual or Organization
   (&quot;Licensee&quot;) accessing and otherwise using this software in source or binary
   form and its associated documentation (&quot;the Software&quot;).

2. Subject to the terms and conditions of this BeOpen Python License Agreement,
   BeOpen hereby grants Licensee a non-exclusive, royalty-free, world-wide license
   to reproduce, analyze, test, perform and/or display publicly, prepare derivative
   works, distribute, and otherwise use the Software alone or in any derivative
   version, provided, however, that the BeOpen Python License is retained in the
   Software, alone or in any derivative version prepared by Licensee.

3. BeOpen is making the Software available to Licensee on an &quot;AS IS&quot; basis.
   BEOPEN MAKES NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED.  BY WAY OF
   EXAMPLE, BUT NOT LIMITATION, BEOPEN MAKES NO AND DISCLAIMS ANY REPRESENTATION OR
   WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR THAT THE
   USE OF THE SOFTWARE WILL NOT INFRINGE ANY THIRD PARTY RIGHTS.

4. BEOPEN SHALL NOT BE LIABLE TO LICENSEE OR ANY OTHER USERS OF THE SOFTWARE FOR
   ANY INCIDENTAL, SPECIAL, OR CONSEQUENTIAL DAMAGES OR LOSS AS A RESULT OF USING,
   MODIFYING OR DISTRIBUTING THE SOFTWARE, OR ANY DERIVATIVE THEREOF, EVEN IF
   ADVISED OF THE POSSIBILITY THEREOF.

5. This License Agreement will automatically terminate upon a material breach of
   its terms and conditions.

6. This License Agreement shall be governed by and interpreted in all respects
   by the law of the State of California, excluding conflict of law provisions.
   Nothing in this License Agreement shall be deemed to create any relationship of
   agency, partnership, or joint venture between BeOpen and Licensee.  This License
   Agreement does not grant permission to use BeOpen trademarks or trade names in a
   trademark sense to endorse or promote products or services of Licensee, or any
   third party.  As an exception, the &quot;BeOpen Python&quot; logos available at
   http://www.pythonlabs.com/logos.html may be used according to the permissions
   granted on that web page.

7. By copying, installing or otherwise using the software, Licensee agrees to be
   bound by the terms and conditions of this License Agreement.
</pre></div>
</div>
</section>
<section id="cnri-license-agreement-for-python-1-6-1">
<h3>CNRI LICENSE AGREEMENT FOR PYTHON 1.6.1<a class="headerlink" href="#cnri-license-agreement-for-python-1-6-1" title="Permalink to this headline">¶</a></h3>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>1. This LICENSE AGREEMENT is between the Corporation for National Research
   Initiatives, having an office at 1895 Preston White Drive, Reston, VA 20191
   (&quot;CNRI&quot;), and the Individual or Organization (&quot;Licensee&quot;) accessing and
   otherwise using Python 1.6.1 software in source or binary form and its
   associated documentation.

2. Subject to the terms and conditions of this License Agreement, CNRI hereby
   grants Licensee a nonexclusive, royalty-free, world-wide license to reproduce,
   analyze, test, perform and/or display publicly, prepare derivative works,
   distribute, and otherwise use Python 1.6.1 alone or in any derivative version,
   provided, however, that CNRI&#39;s License Agreement and CNRI&#39;s notice of copyright,
   i.e., &quot;Copyright © 1995-2001 Corporation for National Research Initiatives; All
   Rights Reserved&quot; are retained in Python 1.6.1 alone or in any derivative version
   prepared by Licensee.  Alternately, in lieu of CNRI&#39;s License Agreement,
   Licensee may substitute the following text (omitting the quotes): &quot;Python 1.6.1
   is made available subject to the terms and conditions in CNRI&#39;s License
   Agreement.  This Agreement together with Python 1.6.1 may be located on the
   Internet using the following unique, persistent identifier (known as a handle):
   1895.22/1013.  This Agreement may also be obtained from a proxy server on the
   Internet using the following URL: http://hdl.handle.net/1895.22/1013.&quot;

3. In the event Licensee prepares a derivative work that is based on or
   incorporates Python 1.6.1 or any part thereof, and wants to make the derivative
   work available to others as provided herein, then Licensee hereby agrees to
   include in any such work a brief summary of the changes made to Python 1.6.1.

4. CNRI is making Python 1.6.1 available to Licensee on an &quot;AS IS&quot; basis.  CNRI
   MAKES NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED.  BY WAY OF EXAMPLE,
   BUT NOT LIMITATION, CNRI MAKES NO AND DISCLAIMS ANY REPRESENTATION OR WARRANTY
   OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR THAT THE USE OF
   PYTHON 1.6.1 WILL NOT INFRINGE ANY THIRD PARTY RIGHTS.

5. CNRI SHALL NOT BE LIABLE TO LICENSEE OR ANY OTHER USERS OF PYTHON 1.6.1 FOR
   ANY INCIDENTAL, SPECIAL, OR CONSEQUENTIAL DAMAGES OR LOSS AS A RESULT OF
   MODIFYING, DISTRIBUTING, OR OTHERWISE USING PYTHON 1.6.1, OR ANY DERIVATIVE
   THEREOF, EVEN IF ADVISED OF THE POSSIBILITY THEREOF.

6. This License Agreement will automatically terminate upon a material breach of
   its terms and conditions.

7. This License Agreement shall be governed by the federal intellectual property
   law of the United States, including without limitation the federal copyright
   law, and, to the extent such U.S. federal law does not apply, by the law of the
   Commonwealth of Virginia, excluding Virginia&#39;s conflict of law provisions.
   Notwithstanding the foregoing, with regard to derivative works based on Python
   1.6.1 that incorporate non-separable material that was previously distributed
   under the GNU General Public License (GPL), the law of the Commonwealth of
   Virginia shall govern this License Agreement only as to issues arising under or
   with respect to Paragraphs 4, 5, and 7 of this License Agreement.  Nothing in
   this License Agreement shall be deemed to create any relationship of agency,
   partnership, or joint venture between CNRI and Licensee.  This License Agreement
   does not grant permission to use CNRI trademarks or trade name in a trademark
   sense to endorse or promote products or services of Licensee, or any third
   party.

8. By clicking on the &quot;ACCEPT&quot; button where indicated, or by copying, installing
   or otherwise using Python 1.6.1, Licensee agrees to be bound by the terms and
   conditions of this License Agreement.
</pre></div>
</div>
</section>
<section id="cwi-license-agreement-for-python-0-9-0-through-1-2">
<h3>CWI LICENSE AGREEMENT FOR PYTHON 0.9.0 THROUGH 1.2<a class="headerlink" href="#cwi-license-agreement-for-python-0-9-0-through-1-2" title="Permalink to this headline">¶</a></h3>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Copyright © 1991 - 1995, Stichting Mathematisch Centrum Amsterdam, The
Netherlands.  All rights reserved.

Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted, provided that
the above copyright notice appear in all copies and that both that copyright
notice and this permission notice appear in supporting documentation, and that
the name of Stichting Mathematisch Centrum or CWI not be used in advertising or
publicity pertaining to distribution of the software without specific, written
prior permission.

STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE FOR ANY SPECIAL, INDIRECT
OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
SOFTWARE.
</pre></div>
</div>
</section>
<section id="zero-clause-bsd-license-for-code-in-the-python-release-documentation">
<span id="bsd0"></span><h3>ZERO-CLAUSE BSD LICENSE FOR CODE IN THE PYTHON 3.9.6 DOCUMENTATION<a class="headerlink" href="#zero-clause-bsd-license-for-code-in-the-python-release-documentation" title="Permalink to this headline">¶</a></h3>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted.

THE SOFTWARE IS PROVIDED &quot;AS IS&quot; AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
PERFORMANCE OF THIS SOFTWARE.
</pre></div>
</div>
</section>
</section>
<section id="licenses-and-acknowledgements-for-incorporated-software">
<span id="otherlicenses"></span><h2>Licenses and Acknowledgements for Incorporated Software<a class="headerlink" href="#licenses-and-acknowledgements-for-incorporated-software" title="Permalink to this headline">¶</a></h2>
<p>This section is an incomplete, but growing list of licenses and acknowledgements
for third-party software incorporated in the Python distribution.</p>
<section id="mersenne-twister">
<h3>Mersenne Twister<a class="headerlink" href="#mersenne-twister" title="Permalink to this headline">¶</a></h3>
<p>The <code class="xref py py-mod docutils literal notranslate"><span class="pre">_random</span></code> module includes code based on a download from
<a class="reference external" href="http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/MT2002/emt19937ar.html">http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/MT2002/emt19937ar.html</a>. The following are
the verbatim comments from the original code:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>A C-program for MT19937, with initialization improved 2002/1/26.
Coded by Takuji Nishimura and Makoto Matsumoto.

Before using, initialize the state by using init_genrand(seed)
or init_by_array(init_key, key_length).

Copyright (C) 1997 - 2002, Makoto Matsumoto and Takuji Nishimura,
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:

 1. Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.

 2. Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in the
    documentation and/or other materials provided with the distribution.

 3. The names of its contributors may not be used to endorse or promote
    products derived from this software without specific prior written
    permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
&quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


Any feedback is very welcome.
http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/emt.html
email: m-mat @ math.sci.hiroshima-u.ac.jp (remove space)
</pre></div>
</div>
</section>
<section id="sockets">
<h3>Sockets<a class="headerlink" href="#sockets" title="Permalink to this headline">¶</a></h3>
<p>The <a class="reference internal" href="library/socket.html#module-socket" title="socket: Low-level networking interface."><code class="xref py py-mod docutils literal notranslate"><span class="pre">socket</span></code></a> module uses the functions, <code class="xref py py-func docutils literal notranslate"><span class="pre">getaddrinfo()</span></code>, and
<code class="xref py py-func docutils literal notranslate"><span class="pre">getnameinfo()</span></code>, which are coded in separate source files from the WIDE
Project, <a class="reference external" href="http://www.wide.ad.jp/">http://www.wide.ad.jp/</a>.</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
3. Neither the name of the project nor the names of its contributors
   may be used to endorse or promote products derived from this software
   without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS&#39;&#39; AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
</pre></div>
</div>
</section>
<section id="asynchronous-socket-services">
<h3>Asynchronous socket services<a class="headerlink" href="#asynchronous-socket-services" title="Permalink to this headline">¶</a></h3>
<p>The <a class="reference internal" href="library/asynchat.html#module-asynchat" title="asynchat: Support for asynchronous command/response protocols."><code class="xref py py-mod docutils literal notranslate"><span class="pre">asynchat</span></code></a> and <a class="reference internal" href="library/asyncore.html#module-asyncore" title="asyncore: A base class for developing asynchronous socket handling services."><code class="xref py py-mod docutils literal notranslate"><span class="pre">asyncore</span></code></a> modules contain the following notice:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Copyright 1996 by Sam Rushing

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and
its documentation for any purpose and without fee is hereby
granted, provided that the above copyright notice appear in all
copies and that both that copyright notice and this permission
notice appear in supporting documentation, and that the name of Sam
Rushing not be used in advertising or publicity pertaining to
distribution of the software without specific, written prior
permission.

SAM RUSHING DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
NO EVENT SHALL SAM RUSHING BE LIABLE FOR ANY SPECIAL, INDIRECT OR
CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
</pre></div>
</div>
</section>
<section id="cookie-management">
<h3>Cookie management<a class="headerlink" href="#cookie-management" title="Permalink to this headline">¶</a></h3>
<p>The <a class="reference internal" href="library/http.cookies.html#module-http.cookies" title="http.cookies: Support for HTTP state management (cookies)."><code class="xref py py-mod docutils literal notranslate"><span class="pre">http.cookies</span></code></a> module contains the following notice:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Copyright 2000 by Timothy O&#39;Malley &lt;timo@alum.mit.edu&gt;

               All Rights Reserved

Permission to use, copy, modify, and distribute this software
and its documentation for any purpose and without fee is hereby
granted, provided that the above copyright notice appear in all
copies and that both that copyright notice and this permission
notice appear in supporting documentation, and that the name of
Timothy O&#39;Malley  not be used in advertising or publicity
pertaining to distribution of the software without specific, written
prior permission.

Timothy O&#39;Malley DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS, IN NO EVENT SHALL Timothy O&#39;Malley BE LIABLE FOR
ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
PERFORMANCE OF THIS SOFTWARE.
</pre></div>
</div>
</section>
<section id="execution-tracing">
<h3>Execution tracing<a class="headerlink" href="#execution-tracing" title="Permalink to this headline">¶</a></h3>
<p>The <a class="reference internal" href="library/trace.html#module-trace" title="trace: Trace or track Python statement execution."><code class="xref py py-mod docutils literal notranslate"><span class="pre">trace</span></code></a> module contains the following notice:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>portions copyright 2001, Autonomous Zones Industries, Inc., all rights...
err...  reserved and offered to the public under the terms of the
Python 2.2 license.
Author: Zooko O&#39;Whielacronx
http://zooko.com/
mailto:zooko@zooko.com

Copyright 2000, Mojam Media, Inc., all rights reserved.
Author: Skip Montanaro

Copyright 1999, Bioreason, Inc., all rights reserved.
Author: Andrew Dalke

Copyright 1995-1997, Automatrix, Inc., all rights reserved.
Author: Skip Montanaro

Copyright 1991-1995, Stichting Mathematisch Centrum, all rights reserved.


Permission to use, copy, modify, and distribute this Python software and
its associated documentation for any purpose without fee is hereby
granted, provided that the above copyright notice appears in all copies,
and that both that copyright notice and this permission notice appear in
supporting documentation, and that the name of neither Automatrix,
Bioreason or Mojam Media be used in advertising or publicity pertaining to
distribution of the software without specific, written prior permission.
</pre></div>
</div>
</section>
<section id="uuencode-and-uudecode-functions">
<h3>UUencode and UUdecode functions<a class="headerlink" href="#uuencode-and-uudecode-functions" title="Permalink to this headline">¶</a></h3>
<p>The <a class="reference internal" href="library/uu.html#module-uu" title="uu: Encode and decode files in uuencode format."><code class="xref py py-mod docutils literal notranslate"><span class="pre">uu</span></code></a> module contains the following notice:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Copyright 1994 by Lance Ellinghouse
Cathedral City, California Republic, United States of America.
                       All Rights Reserved
Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in
supporting documentation, and that the name of Lance Ellinghouse
not be used in advertising or publicity pertaining to distribution
of the software without specific, written prior permission.
LANCE ELLINGHOUSE DISCLAIMS ALL WARRANTIES WITH REGARD TO
THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS, IN NO EVENT SHALL LANCE ELLINGHOUSE CENTRUM BE LIABLE
FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

Modified by Jack Jansen, CWI, July 1995:
- Use binascii module to do the actual line-by-line conversion
  between ascii and binary. This results in a 1000-fold speedup. The C
  version is still 5 times faster, though.
- Arguments more compliant with Python standard
</pre></div>
</div>
</section>
<section id="xml-remote-procedure-calls">
<h3>XML Remote Procedure Calls<a class="headerlink" href="#xml-remote-procedure-calls" title="Permalink to this headline">¶</a></h3>
<p>The <a class="reference internal" href="library/xmlrpc.client.html#module-xmlrpc.client" title="xmlrpc.client: XML-RPC client access."><code class="xref py py-mod docutils literal notranslate"><span class="pre">xmlrpc.client</span></code></a> module contains the following notice:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>    The XML-RPC client interface is

Copyright (c) 1999-2002 by Secret Labs AB
Copyright (c) 1999-2002 by Fredrik Lundh

By obtaining, using, and/or copying this software and/or its
associated documentation, you agree that you have read, understood,
and will comply with the following terms and conditions:

Permission to use, copy, modify, and distribute this software and
its associated documentation for any purpose and without fee is
hereby granted, provided that the above copyright notice appears in
all copies, and that both that copyright notice and this permission
notice appear in supporting documentation, and that the name of
Secret Labs AB or the author not be used in advertising or publicity
pertaining to distribution of the software without specific, written
prior permission.

SECRET LABS AB AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANT-
ABILITY AND FITNESS.  IN NO EVENT SHALL SECRET LABS AB OR THE AUTHOR
BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
OF THIS SOFTWARE.
</pre></div>
</div>
</section>
<section id="test-epoll">
<h3>test_epoll<a class="headerlink" href="#test-epoll" title="Permalink to this headline">¶</a></h3>
<p>The <code class="xref py py-mod docutils literal notranslate"><span class="pre">test_epoll</span></code> module contains the following notice:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Copyright (c) 2001-2006 Twisted Matrix Laboratories.

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
&quot;Software&quot;), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED &quot;AS IS&quot;, WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
</pre></div>
</div>
</section>
<section id="select-kqueue">
<h3>Select kqueue<a class="headerlink" href="#select-kqueue" title="Permalink to this headline">¶</a></h3>
<p>The <a class="reference internal" href="library/select.html#module-select" title="select: Wait for I/O completion on multiple streams."><code class="xref py py-mod docutils literal notranslate"><span class="pre">select</span></code></a> module contains the following notice for the kqueue
interface:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Copyright (c) 2000 Doug White, 2006 James Knight, 2007 Christian Heimes
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS&#39;&#39; AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
</pre></div>
</div>
</section>
<section id="siphash24">
<h3>SipHash24<a class="headerlink" href="#siphash24" title="Permalink to this headline">¶</a></h3>
<p>The file <code class="file docutils literal notranslate"><span class="pre">Python/pyhash.c</span></code> contains Marek Majkowski’ implementation of
Dan Bernstein’s SipHash24 algorithm. It contains the following note:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>&lt;MIT License&gt;
Copyright (c) 2013  Marek Majkowski &lt;marek@popcount.org&gt;

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the &quot;Software&quot;), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
&lt;/MIT License&gt;

Original location:
   https://github.com/majek/csiphash/

Solution inspired by code from:
   Samuel Neves (supercop/crypto_auth/siphash24/little)
   djb (supercop/crypto_auth/siphash24/little2)
   Jean-Philippe Aumasson (https://131002.net/siphash/siphash24.c)
</pre></div>
</div>
</section>
<section id="strtod-and-dtoa">
<h3>strtod and dtoa<a class="headerlink" href="#strtod-and-dtoa" title="Permalink to this headline">¶</a></h3>
<p>The file <code class="file docutils literal notranslate"><span class="pre">Python/dtoa.c</span></code>, which supplies C functions dtoa and
strtod for conversion of C doubles to and from strings, is derived
from the file of the same name by David M. Gay, currently available
from <a class="reference external" href="http://www.netlib.org/fp/">http://www.netlib.org/fp/</a>.  The original file, as retrieved on
March 16, 2009, contains the following copyright and licensing
notice:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>/****************************************************************
 *
 * The author of this software is David M. Gay.
 *
 * Copyright (c) 1991, 2000, 2001 by Lucent Technologies.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose without fee is hereby granted, provided that this entire notice
 * is included in all copies of any software which is or includes a copy
 * or modification of this software and in all copies of the supporting
 * documentation for such software.
 *
 * THIS SOFTWARE IS BEING PROVIDED &quot;AS IS&quot;, WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTY.  IN PARTICULAR, NEITHER THE AUTHOR NOR LUCENT MAKES ANY
 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
 * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
 *
 ***************************************************************/
</pre></div>
</div>
</section>
<section id="openssl">
<h3>OpenSSL<a class="headerlink" href="#openssl" title="Permalink to this headline">¶</a></h3>
<p>The modules <a class="reference internal" href="library/hashlib.html#module-hashlib" title="hashlib: Secure hash and message digest algorithms."><code class="xref py py-mod docutils literal notranslate"><span class="pre">hashlib</span></code></a>, <a class="reference internal" href="library/posix.html#module-posix" title="posix: The most common POSIX system calls (normally used via module os). (Unix)"><code class="xref py py-mod docutils literal notranslate"><span class="pre">posix</span></code></a>, <a class="reference internal" href="library/ssl.html#module-ssl" title="ssl: TLS/SSL wrapper for socket objects"><code class="xref py py-mod docutils literal notranslate"><span class="pre">ssl</span></code></a>, <a class="reference internal" href="library/crypt.html#module-crypt" title="crypt: The crypt() function used to check Unix passwords. (Unix)"><code class="xref py py-mod docutils literal notranslate"><span class="pre">crypt</span></code></a> use
the OpenSSL library for added performance if made available by the
operating system. Additionally, the Windows and Mac OS X installers for
Python may include a copy of the OpenSSL libraries, so we include a copy
of the OpenSSL license here:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span> LICENSE ISSUES
 ==============

 The OpenSSL toolkit stays under a dual license, i.e. both the conditions of
 the OpenSSL License and the original SSLeay license apply to the toolkit.
 See below for the actual license texts. Actually both licenses are BSD-style
 Open Source licenses. In case of any license issues related to OpenSSL
 please contact openssl-core@openssl.org.

 OpenSSL License
 ---------------

   /* ====================================================================
    * Copyright (c) 1998-2008 The OpenSSL Project.  All rights reserved.
    *
    * Redistribution and use in source and binary forms, with or without
    * modification, are permitted provided that the following conditions
    * are met:
    *
    * 1. Redistributions of source code must retain the above copyright
    *    notice, this list of conditions and the following disclaimer.
    *
    * 2. Redistributions in binary form must reproduce the above copyright
    *    notice, this list of conditions and the following disclaimer in
    *    the documentation and/or other materials provided with the
    *    distribution.
    *
    * 3. All advertising materials mentioning features or use of this
    *    software must display the following acknowledgment:
    *    &quot;This product includes software developed by the OpenSSL Project
    *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)&quot;
    *
    * 4. The names &quot;OpenSSL Toolkit&quot; and &quot;OpenSSL Project&quot; must not be used to
    *    endorse or promote products derived from this software without
    *    prior written permission. For written permission, please contact
    *    openssl-core@openssl.org.
    *
    * 5. Products derived from this software may not be called &quot;OpenSSL&quot;
    *    nor may &quot;OpenSSL&quot; appear in their names without prior written
    *    permission of the OpenSSL Project.
    *
    * 6. Redistributions of any form whatsoever must retain the following
    *    acknowledgment:
    *    &quot;This product includes software developed by the OpenSSL Project
    *    for use in the OpenSSL Toolkit (http://www.openssl.org/)&quot;
    *
    * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS&#39;&#39; AND ANY
    * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
    * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
    * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
    * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
    * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
    * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
    * OF THE POSSIBILITY OF SUCH DAMAGE.
    * ====================================================================
    *
    * This product includes cryptographic software written by Eric Young
    * (eay@cryptsoft.com).  This product includes software written by Tim
    * Hudson (tjh@cryptsoft.com).
    *
    */

Original SSLeay License
-----------------------

   /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
    * All rights reserved.
    *
    * This package is an SSL implementation written
    * by Eric Young (eay@cryptsoft.com).
    * The implementation was written so as to conform with Netscapes SSL.
    *
    * This library is free for commercial and non-commercial use as long as
    * the following conditions are aheared to.  The following conditions
    * apply to all code found in this distribution, be it the RC4, RSA,
    * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
    * included with this distribution is covered by the same copyright terms
    * except that the holder is Tim Hudson (tjh@cryptsoft.com).
    *
    * Copyright remains Eric Young&#39;s, and as such any Copyright notices in
    * the code are not to be removed.
    * If this package is used in a product, Eric Young should be given attribution
    * as the author of the parts of the library used.
    * This can be in the form of a textual message at program startup or
    * in documentation (online or textual) provided with the package.
    *
    * Redistribution and use in source and binary forms, with or without
    * modification, are permitted provided that the following conditions
    * are met:
    * 1. Redistributions of source code must retain the copyright
    *    notice, this list of conditions and the following disclaimer.
    * 2. Redistributions in binary form must reproduce the above copyright
    *    notice, this list of conditions and the following disclaimer in the
    *    documentation and/or other materials provided with the distribution.
    * 3. All advertising materials mentioning features or use of this software
    *    must display the following acknowledgement:
    *    &quot;This product includes cryptographic software written by
    *     Eric Young (eay@cryptsoft.com)&quot;
    *    The word &#39;cryptographic&#39; can be left out if the rouines from the library
    *    being used are not cryptographic related :-).
    * 4. If you include any Windows specific code (or a derivative thereof) from
    *    the apps directory (application code) you must include an acknowledgement:
    *    &quot;This product includes software written by Tim Hudson (tjh@cryptsoft.com)&quot;
    *
    * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS&#39;&#39; AND
    * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
    * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
    * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
    * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
    * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    * SUCH DAMAGE.
    *
    * The licence and distribution terms for any publically available version or
    * derivative of this code cannot be changed.  i.e. this code cannot simply be
    * copied and put under another distribution licence
    * [including the GNU Public Licence.]
    */
</pre></div>
</div>
</section>
<section id="expat">
<h3>expat<a class="headerlink" href="#expat" title="Permalink to this headline">¶</a></h3>
<p>The <code class="xref py py-mod docutils literal notranslate"><span class="pre">pyexpat</span></code> extension is built using an included copy of the expat
sources unless the build is configured <code class="docutils literal notranslate"><span class="pre">--with-system-expat</span></code>:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Copyright (c) 1998, 1999, 2000 Thai Open Source Software Center Ltd
                               and Clark Cooper

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
&quot;Software&quot;), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED &quot;AS IS&quot;, WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
</pre></div>
</div>
</section>
<section id="libffi">
<h3>libffi<a class="headerlink" href="#libffi" title="Permalink to this headline">¶</a></h3>
<p>The <code class="xref py py-mod docutils literal notranslate"><span class="pre">_ctypes</span></code> extension is built using an included copy of the libffi
sources unless the build is configured <code class="docutils literal notranslate"><span class="pre">--with-system-libffi</span></code>:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Copyright (c) 1996-2008  Red Hat, Inc and others.

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
``Software&#39;&#39;), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED ``AS IS&#39;&#39;, WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
</pre></div>
</div>
</section>
<section id="zlib">
<h3>zlib<a class="headerlink" href="#zlib" title="Permalink to this headline">¶</a></h3>
<p>The <a class="reference internal" href="library/zlib.html#module-zlib" title="zlib: Low-level interface to compression and decompression routines compatible with gzip."><code class="xref py py-mod docutils literal notranslate"><span class="pre">zlib</span></code></a> extension is built using an included copy of the zlib
sources if the zlib version found on the system is too old to be
used for the build:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Copyright (C) 1995-2011 Jean-loup Gailly and Mark Adler

This software is provided &#39;as-is&#39;, without any express or implied
warranty.  In no event will the authors be held liable for any damages
arising from the use of this software.

Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not
   claim that you wrote the original software. If you use this software
   in a product, an acknowledgment in the product documentation would be
   appreciated but is not required.

2. Altered source versions must be plainly marked as such, and must not be
   misrepresented as being the original software.

3. This notice may not be removed or altered from any source distribution.

Jean-loup Gailly        Mark Adler
jloup@gzip.org          madler@alumni.caltech.edu
</pre></div>
</div>
</section>
<section id="cfuhash">
<h3>cfuhash<a class="headerlink" href="#cfuhash" title="Permalink to this headline">¶</a></h3>
<p>The implementation of the hash table used by the <a class="reference internal" href="library/tracemalloc.html#module-tracemalloc" title="tracemalloc: Trace memory allocations."><code class="xref py py-mod docutils literal notranslate"><span class="pre">tracemalloc</span></code></a> is based
on the cfuhash project:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Copyright (c) 2005 Don Owens
All rights reserved.

This code is released under the BSD license:

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:

  * Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.

  * Redistributions in binary form must reproduce the above
    copyright notice, this list of conditions and the following
    disclaimer in the documentation and/or other materials provided
    with the distribution.

  * Neither the name of the author nor the names of its
    contributors may be used to endorse or promote products derived
    from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
&quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
OF THE POSSIBILITY OF SUCH DAMAGE.
</pre></div>
</div>
</section>
<section id="libmpdec">
<h3>libmpdec<a class="headerlink" href="#libmpdec" title="Permalink to this headline">¶</a></h3>
<p>The <code class="xref py py-mod docutils literal notranslate"><span class="pre">_decimal</span></code> module is built using an included copy of the libmpdec
library unless the build is configured <code class="docutils literal notranslate"><span class="pre">--with-system-libmpdec</span></code>:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Copyright (c) 2008-2020 Stefan Krah. All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:

1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS &quot;AS IS&quot; AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
</pre></div>
</div>
</section>
<section id="w3c-c14n-test-suite">
<h3>W3C C14N test suite<a class="headerlink" href="#w3c-c14n-test-suite" title="Permalink to this headline">¶</a></h3>
<p>The C14N 2.0 test suite in the <a class="reference internal" href="library/test.html#module-test" title="test: Regression tests package containing the testing suite for Python."><code class="xref py py-mod docutils literal notranslate"><span class="pre">test</span></code></a> package
(<code class="docutils literal notranslate"><span class="pre">Lib/test/xmltestdata/c14n-20/</span></code>) was retrieved from the W3C website at
<a class="reference external" href="https://www.w3.org/TR/xml-c14n2-testcases/">https://www.w3.org/TR/xml-c14n2-testcases/</a> and is distributed under the
3-clause BSD license:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Copyright (c) 2013 W3C(R) (MIT, ERCIM, Keio, Beihang),
All Rights Reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:

* Redistributions of works must retain the original copyright notice,
  this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the original copyright
  notice, this list of conditions and the following disclaimer in the
  documentation and/or other materials provided with the distribution.
* Neither the name of the W3C nor the names of its contributors may be
  used to endorse or promote products derived from this work without
  specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
&quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
</pre></div>
</div>
</section>
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<li><a class="reference internal" href="#sockets">Sockets</a></li>
<li><a class="reference internal" href="#asynchronous-socket-services">Asynchronous socket services</a></li>
<li><a class="reference internal" href="#cookie-management">Cookie management</a></li>
<li><a class="reference internal" href="#execution-tracing">Execution tracing</a></li>
<li><a class="reference internal" href="#uuencode-and-uudecode-functions">UUencode and UUdecode functions</a></li>
<li><a class="reference internal" href="#xml-remote-procedure-calls">XML Remote Procedure Calls</a></li>
<li><a class="reference internal" href="#test-epoll">test_epoll</a></li>
<li><a class="reference internal" href="#select-kqueue">Select kqueue</a></li>
<li><a class="reference internal" href="#siphash24">SipHash24</a></li>
<li><a class="reference internal" href="#strtod-and-dtoa">strtod and dtoa</a></li>
<li><a class="reference internal" href="#openssl">OpenSSL</a></li>
<li><a class="reference internal" href="#expat">expat</a></li>
<li><a class="reference internal" href="#libffi">libffi</a></li>
<li><a class="reference internal" href="#zlib">zlib</a></li>
<li><a class="reference internal" href="#cfuhash">cfuhash</a></li>
<li><a class="reference internal" href="#libmpdec">libmpdec</a></li>
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